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    <title>glUniformBlockBinding - OpenGL ES 3 Reference Pages</title>
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    <div class="refentry" id="glUniformBlockBinding">
      <div class="titlepage"/>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glUniformBlockBinding — assign a binding point to an active uniform block</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glUniformBlockBinding</strong>(</code>
              </td>
              <td>GLuint <var class="pdparam">program</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLuint <var class="pdparam">uniformBlockIndex</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLuint <var class="pdparam">uniformBlockBinding</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>program</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The name of a program object containing the active uniform block whose binding to assign.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>uniformBlockIndex</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The index of the active uniform block within <em class="parameter"><code>program</code></em> whose binding to assign.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>uniformBlockBinding</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the binding point to which to bind the uniform block with index <em class="parameter"><code>uniformBlockIndex</code></em> within <em class="parameter"><code>program</code></em>.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            Binding points for active uniform blocks are assigned using <code class="function">glUniformBlockBinding</code>. Each of a program's active uniform
            blocks has a corresponding uniform buffer binding point. <em class="parameter"><code>program</code></em> is the name of a program object for which the command
            <a class="citerefentry" href="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a> has been issued in the past.
        </p>
        <p>
            If successful, <code class="function">glUniformBlockBinding</code> specifies that <em class="parameter"><code>program</code></em> will use the data store of the
            buffer object bound to the binding point <em class="parameter"><code>uniformBlockBinding</code></em> to extract the values of the uniforms in the
            uniform block identified by <em class="parameter"><code>uniformBlockIndex</code></em>.
        </p>
        <p>
            When a program object is linked or re-linked, the uniform buffer object binding point assigned to each of its active uniform blocks is reset to zero.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>uniformBlockIndex</code></em> is not an active uniform block index of <em class="parameter"><code>program</code></em>.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>uniformBlockBinding</code></em> is greater than or equal to the value of <code class="constant">GL_MAX_UNIFORM_BUFFER_BINDINGS</code>.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not the name of a program object generated by the GL.
        </p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p>
            <a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_UNIFORM_BUFFER_BINDINGS</code>
        </p>
        <p>
            <a class="citerefentry" href="glGetActiveUniformBlockiv.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetActiveUniformBlockiv</span></span></a> with argument <code class="constant">GL_UNIFORM_BLOCK_BINDING</code>
        </p>
      </div>
      <div class="refsect1" id="versions">
        <h2>API Version Support</h2>
        <div class="informaltable">
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              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">
                 
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="2">
                <span class="bold"><strong>OpenGL ES API Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">glUniformBlockBinding</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
            <a class="citerefentry" href="glBindBufferBase.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindBufferBase</span></span></a>,
            <a class="citerefentry" href="glBindBufferRange.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindBufferRange</span></span></a>,
            <a class="citerefentry" href="glGetActiveUniformBlockiv.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetActiveUniformBlockiv</span></span></a>
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p>
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